/*
 * C++ function
 */

#include <iostream>

using namespace std;

double square(double x) { return x * x; }

void print_squire(double x) {
    cout << "the square of " << x << " is " << square(x) << endl;
}

int main() {
    print_squire(1.234);
    // try the c++14 feature, "Digital separators", using the single-quote `'`
    // character.
    cout << 123'222'321 << endl;
    return 0;
}
